2.4.17 -> 2.4.39 replication: null callback : error code 0x10

[Andrei Valoshyn <avaloshyn@exadel.com>]

Hello!
> Aug 21 01:42:45 slapd[4658]: null_callback : error code 0x10
> Aug 21 01:42:45 slapd[4658]: syncrepl_entry: rid=107 be_modify failed 
> (16)
> Aug 21 01:42:45 slapd[4658]: do_syncrepl: rid=107 rc 16 retrying (9 
> retries left)
>
> Master (OpenLDAP: slapd 2.4.17, 64bit openSUSE 11.2) and slave 
> (OpenLDAP: slapd  2.4.31, 64bit openSUSE 12.2)
>
> master slapd.conf syncprov configuration :
> .......
> overlay syncprov
> syncprov-checkpoint 100 10
> syncprov-sessionlog 100
> ..........
>
> slave master slapd.conf syncprov configuration:
> ...................................
> syncrepl rid=107        provider=ldaps://master.domen.com \
>                         type=refreshOnly \
>                         interval=00:00:02:00 \
>                         scope=sub \
>                         schemachecking=off \
>                         searchbase="dc=domen,dc=com" \
>                         bindmethod=simple \
>                         binddn="dc=domen,dc=com" \
>                         credentials=**** \
>                         retry="60 10 300 10"
> ......................
>
> I have these errors on all my slaves. What may be the cause of those 
> errors? I have no idea about that. Please HELP!